<template>
  <div class="login-container">
    <!-- 当前页面的导航栏 -->
    <van-nav-bar
      class="page-nav-bar"
      title="登录"
    >
      <van-icon slot="left" name="cross" @click="$router.back()" />
    </van-nav-bar>
    <!-- 登录的表单 -->
    <van-form
      @submit="onSubmit"
      ref="loginForm"
    >
      <van-field
        name="mobile"
        v-model="user.mobile"
        placeholder="请输入手机号"
        :rules="userFormRules.mobile"
        type="number"
        maxlength="11"
      >
        <i
          slot="left-icon"
          class="toutiao toutiao-shouji"
        ></i>
      </van-field>
      <van-field
        v-model="user.code"
        name="code"
        placeholder="请输入验证码"
        :rules="userFormRules.code"
        type="number"
        maxlength="6"
      >
        <i
          slot="left-icon"
          class="toutiao toutiao-yanzhengma"
        ></i>
        <template #button>
          <!-- time倒计时时间 -->
          <van-count-down
            v-if="isCountDownShow"
            :time="1000 * 60"
            format="ss s"
            @finish="isCountDownShow = false"
          />
          <van-button
            v-else
            class="send-sms-btn"
            round
            size="small"
            type="default"
            @click="onSendsms"
            native-type="button"
          >发送验证码</van-button>
        </template>
      </van-field>
      <div class="login-btn-wrap">
        <van-button
          class="login-btn"
          block
          type="info"
          native-type="submit"
        >登录</van-button>
      </div>
    </van-form>
  </div>
</template>

<script>
import { login, sendSms } from '@/api/user'
export default {
  name: 'LoginIndex',
  components: {},
  props: {},
  data () {
    return {
      user: {
        mobile: '', // 手机号
        code: '' // 验证码
      },
      userFormRules: {
        mobile: [
          {
            require: true,
            message: '手机号不能为空'
          },
          {
            pattern: /^1[3|5|7|8]\d{9}$/,
            message: '手机号格式错误'
          }
        ],
        code: [
          {
            require: true,
            message: '验证码不能为空'
          },
          {
            pattern: /^\d{6}$/,
            message: '验证码格式错误'
          }
        ]
      },
      isCountDownShow: false // 是否展示倒计时
    }
  },
  computed: {},
  watch: {},
  created () {},
  monunted () {},
  methods: {
    async onSubmit () {
      // 1.获取表单数据
      const user = this.user
      this.$toast.loading({
        message: '登录中...',
        forbidClick: true, // 禁用背景点击
        duration: 0 // 持续时间，默认为 2000，如果为0 则持续展示
      })
      // 2.表单验证
      // 3.提交表单请求登录
      try {
        const { data } = await login(user)
        this.$store.commit('setUser', data.data)
        this.$toast.success('登录成功')
        // 登陆成功 跳转回原来的页面
        // back 的方式不严谨
        this.$router.back()
      } catch (err) {
        if (err.response.status === 400) {
          this.$toast.fail('手机号或验证码错误')
        } else {
          this.$toast.fail('登录失败，请稍后重试')
        }
      }
      // 4. 根据请求响应结构处理后续操作
    },
    async onSendsms () {
      // 1. 校验手机号码
      try {
        await this.$refs.loginForm.validate('mobile')
        console.log('验证通过')
      } catch (err) {
        return console.log('验证失败', err)
      }
      // 2. 验证通过，显示倒计时
      this.isCountDownShow = true
      // 3. 请求发送验证码
      try {
        await sendSms(this.user.mobile)
        this.$toast('发送成功')
      } catch (err) {
        this.isCountDownShow = false
        if (err.response.status === 429) {
          this.$toast('发送太频繁了，请稍后重试')
        } else {
          this.$toast('发送失败，请稍后重试')
        }
      }
    }
  }
}
</script>

<style scoped lang="less">
.login-container {
  .toutiao {
    font-size: 37px;
  }

  .send-sms-btn {
    background-color: #ededed;
    width: 160px;
    height: 46px;
    line-height: 46px;
    font-size: 14px;
    color: #666;
  }

  .login-btn-wrap {
    padding: 53px 33px;
    .login-btn {
      background-color: #6db4fb;
      border: none;
    }
  }
}
</style>
